Piston



June 75 1932. A. l., ARMENfRoUT 1,862,251

P1 sToN Filed Jan. 13, 193o \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\W\\m&

e. a@ \f l f 50 i a l 5/ WMM l Patented June 7, 1932 PATENT OFFICE IPISTON Application. med `January 1s, 1930, serial No. 420,447.

This invention relates toa piston and relates more particularly to a construction for the piston of a pump, or the like. Y

y In pumps used for handling fluid contain- ,5 ing solid matter at high pressures, for example slush pumps, the wearing parts or cylins der engaging parts of the pistons cut out very quickly through theaction of sand or solid 3 matter in the fluid and the pistons must be Y1o replaced after short periods of use. Only relatively small portions of slush pump pistons receive this excessive wear and the remaining parts of the pistons are not worn to an appreciable extent. Further, the pistons `I of slush pumps, or the like, are usually wedged or clamped onto tapered portions of the piston rods and it is often very diilicultY to remove them from the rods. i y It is a general object ofthe invention t '20 provide a piston particularly suited for use in a slush pump used for handling iiuid containing solid matter.

Another obfect of the invention is to provide a piston for a pump, or the like, in which 2.5 the wearing parts or cylinder engaging parts are replaceable and are inexpensive of manufacture. y Another object of the inventionis to prov," vide a piston construction of the character -30 mentioned in which the wear receivingparts are extremely simple of construction and are easily replaced. Y V

Another object of the invention is to provide a piston rod and piston assemblyfor a pump, or the like, in which the piston may be easily and quickly dismounted from the piston rod. j

A Jfurther object of the invention is to provide a piston rod and piston construction in which the piston is mounted on a portion of the .piston rod having parallel sides and is clamped against an enlargement'or projection on the piston rod. Y

Other objects and Jfeatures of the invention will be best andmore fully understood Jfrom the following detailed descriptions of typical forms and applications of the invention, throughout which description reference is had to the accompanying drawingin which 59 Fig. 1 is a longitudinal Vdetailed'sectional "rod 16.

View of a typical form of slush pump illustrating the piston provided by the vinventionV arranged in the cylinder of the pump. Fig.

2 is an -enlarged vertical detailed sectional A view of the piston showing it mounted on the piston rod provided by the invention. Fig. 3 is an end view of the piston being aview taken as illustrated by line 8-3 on Fig. 2. Fig. is a view similar to F ig. 2 illustrating 5; another form of the invention. mj

The piston rod 4and piston construction provided by this invention may be embodied in various `forms of engines, pumps, etc. The piston is particularlyadapted for use in l ,y a slush pump for handling liquid containing 0.5, solid matter at high pressures vand throughout thev following detailed description I will describe the piston rod and vpiston construction provided by the present invention em- Y bodied in atypical form of slushr pump. It 7o is to be understood, however, that the invene tion is not to be construed as limited tol the particular forms or application of the invention aboutto be described but is to be taken as including anyfeatures `or modifications that i5 may fail within the scope of the claims.

The pump `illustrated inV the drawingis` a typical form of slush pump and includes, generally, a cylinder 10, heads 11 and 12 closing the oppositefends of the cylinder, a liner13 8G in the cylinder 10, a clamp or spider 14 retaining the liner in the cylinder', ports 15 in the opposite ends of the cylinder, and various other parts common to pumps of this general character. v l The present invention provides, generally, a piston rod 16 extending into the cylinder 10,

a piston mounted on' the rod 16 and including, L a body 17 having an end plate 18 at one enc,

a head or end plate 19 mounted on the rod 90 16 at the opposite end of the body, packing 20 on the body between the plates 1,8 and 19, repiaceable cylinder engaging parts 21`carried by the plates 18 and 19Vto slidably enga-ge the cylinder' or liner 13, and a nut 22'clamping 95 the body4 17 .and the plate 19 on the piston The piston rod16 may be similar, generally, tothe piston rods usually employed in pumps, etc. In the drawing I havefshown the piston rod 16 slidable in'an opening 23 in the head 12 and extending into the cylinder 10. A suitable packing gland 24 may be provided in the opening 23 to pack around the rod. The inner end portion of the rod which carries the body 17 of the piston is preferably round in cross sectional configuration 25 of the piston rod. The body 17 may be i mounted directly on the piston rod and the opening 29 may be of uniform diameter' throughout its length. A tapered orbeveled seat 29a `is formed in' the vouter end of the opening 29 to receive the beveled side 27 of the projection 26. The opposite ends of the body 17 are preferably made .flat and vat l'right Yangles to the longitudinal axishof the rod 16. The lendplate .18'i's intheform of an annular radially projecting flange on the onterendpi `the body 17.y The end plate'18 integral with .the'b'odyf The periplieryfot the end plate v1,8 is, spaced inwardly of Walls offtlieliner 13. y An annular recess or ,groove 28 is'v provided inthe innercornerA of the ,pef

` pllery of the plate 18.

The head or plate 19.is mounted on the portion 25ct the piston rod ,16 atvv the inner :fend ofthe body 17; A.The end'plate`19is prefer?` ably separable tromthe bodyl and is4 clamped against the Aend of thebody` by the nuty 22,. The endplate19 is intheform of van :annular disk having` a v'central opening 32 passing .the

, portion'` 25 vthe rod.. .'A tappe-redorv beveled seat 33 "is provided in the opening32'`I to ref oeivetheiend ofthe nut 22` aszWll behereiiil# after described. A'The plate 1,9 'isA preferably fof, the same'dia-ineter astlie end plate A18 its periphery is accordingly',spaced'ffro'ni rthe Walls of the liner 13. An annular recess34 is provided inthe order-peripheral Vcorner-of amplia-19.

YThe i@piaceabiej` .parte ai carried i, ty" the l end plates 18"and119 are one .of the features o ftheiinventionand are provided'to slifdably loperate :on theV Walls oflthelinfer 13,y or the cylinder 1K0.,` Thefpart's 21*carriedby.the'end plates18and19 are preferably alikefinfcon- "stru.ction.'l TheV cylinder`A engaging #parts are in V'the for'mofv rings adapted tOQ-be,arranged on theperipheries of 'the end plates 718 and 19. In the'forin of the invention illustratedin Figi` 2 ofthedrawing2 the/parts 2 1 are screw-threaded ony the plates 1 8 y and 19.LIV is preferably one:r integral 21 mounted on each plate. An inwardly projecting radial flange 35 is vprovided on the part 21, carried by the plate 18, to seat in the annular recess 28.- A similar flange 35 isprovided on the'part 21 carried by the plate 19 to seat in the recess 34 of the end plate 19. r4In the preferredv from ofthe invention packing is provided in the recesses 28 and 34. In the particular case illustrated I have shown packing 37 arranged in annular grooves in the sides of the recesses 2.8 and 34 to seal against the flanges 35 and 35a respectively. In the particular form of the invention illustrated in Figs. 1 and 2 of the drawing, the cylinder engaging part 21 on the end plate 18 is flush With lthe inner side .of the plate 18.y While the outer end et the part 21 on the plate 19 is flush With the outer side of plate 19. In the case shown the parts 21 project axially outward from the opposite ends of the piston.

vThe nut 22 isscreW-tlireaded on the part 25 of the pistonrod Aand clamps against the end plate 19`to retainthe body 17 of the piston on the piston rod'. The nut. 22 has a tapered or beveled end which seats linto'or clamps against the ...seat- 33v of theplate The'nut'22 acts to clamp lthe body17 ongthe pistonrodso thatr the seat 29a ofthe opening 29 clainp'sagainstthe end v27 of thep'rojection 2,6fa1idt-hey nut .also clamps the end plate 17,9 against thefinnerend of thefbodyll,y .A"lock n 'nut 40 may be lprovided Oil the 1.061716.; tolk they Dull 22 yin pOSition. 7 f

,. Thepack'ng 2Q is mountedonthebodyil? @tweenumI platee is and 19: I rhepaeking 20 maybe a unitarybody of rubber'iorother suitable resilient packing materialf and4 is provided to's'l'idably engage orsealfagainst the `'Walls ofthe liner13. f Itis preferred ,that the packing? 2O `be 'tig'fhtlyl clamped between the plates V18 a-nd`19. In thel pieferr'edjforni ,their invention,` means fis providedfffofr feit'- panding or urging the packing2f0 outwardly )vallsof thelinerf 13. fInthe-ormoffth' in;

vention illustrated inthe drawing..anannu-l 1.2111 groove V41 is provided on the-interior or inner Wall'ofthefpacking 20."` A port or passage is provided in thebod-yl andextends ronitheouterjend of the Abody to the; groove into .effective sealing engagementlwith l 41.: Av suitable ycheck val've"43maybe'.` f f ranged in the passage 42.V -Pressurefdei velope'dfin the cylinder 10'of theV pump dur; ing'the back stroke of vthe piston acts tollem pandorurge packingoutwardfinto the proper sealing engagementwith the yvalls'eff the liner. Y

vvIn the -orni ofthe invent-ion Figf4 of thedrawing, 'the vve'ark receiving- ;or

liner engaging partsr 21a' onv the endplates anldlQ? are detachably.securedrto'ethe plates by means of screws 50.Y y Intl-iisA for'rnofrtljie invention theparts 21a.extend over fthe ripheries of :the platesl'auand and are f1.1?

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provided with inwardly projecting radial flanges 51 to seat against the sides of the plates. In the particular case illustrated the flanges 51 of the parts 21a are positioned or formed to seat against the inner side of the plate 19a and to seat against outer side of the plate 18". Suitable bolts or screws 50 extend through openings in the flanges 51 and sci-ev*- thread into the plates 18L and 1911 to detachably secure the parts 21a to the end plates. In this form of the invention, a tapered or ground seat 55 may be provided on a peripheral corner of each of the plates 18@l and 19'r1 to seat against or seal with a ground tapered face 56 on each of the parts 21a. The faces 56 may be formed at the points'of joinder of the flanges 51 and the plates.

It is believed that the utility and practicability of the pist-on construction provided by this invention will be understood from the foregoing detailed description. It is to be noted that the parts 21 and the packing 20 are the only portions of the piston which receive any appreciable wear. The packing and parts 21 may be quickly and easily replaced whendesired or necessary. The parts 21 are extremely simple in formation and are inexpensive of manufacture. The construction embodies a minimum number of parts and the various parts are of simple formation. The piston rod 16 is constructed so that the body 17 of the piston may be quickly and easily removed from the piston rod when desired. The tapered side 27 of the projection 26 and the beveled end on the nut 22 act to properly center the body 17 and the end plate 19 on the rod 16 Without wedging or clamping them on to the rod. It is to be noted that the construction does not embody any parts that require accurate machining,

or that are diflicult or expensive to manufacture.

Having describedonly a typical preferred form of my inventori, I do not wish to limit myself to the specific details set forth but wish to reserve to myselfY any changes or variations that may appear to those skilled in the art or fall within the scope of the` following claims.

Having described my invention, I claim:

1. A piston of the character described including, a body, a head, a detachable annular part screw-threaded on the periphery of the head, and a flange on the part seated in a recess in the head.

2. A piston of the character described including, a body, an integral end plate at one Y end of the body, a separable plate clamped against the opposite end of the body, packing on the body between the plates, a replaceable annular part extending over the periphery of each plate adapted to slidably engage a cylinder wall, and a flange on each part seated in a recessin a plate.

cluding, a body, an integral end plate at one end 0f the body, a separable plate clamped against the opposite end of the body, packing on the body between the plates, a replaceable annular part extending over the periphery of each plate adapted to slidably engage a cylinder wall, and a flange on each part seated in a recess in a plate,k there being packing between the flanges and the lwalls of the recesses.

4. A piston including, a body for mounting on a piston rod, an integral end plate at one .end of the body, a removable end plate clamped against the other end of the body, packing between the end plates for slidably engaging the walls of a cylinder, rings removably screw threaded on the peripheries of the end plates,rflanges on therings seated in recesses in the inner ends of the .end plates, and packing in the recesses for sealing with the flanges.

5. A piston including, a body for mountmovably screw threaded on the peripheries of the end plates, flanges on the rings seated in recesses in the inner ends of the end plates, the inner ends of the rings being flush with inner ends of the end plates, and' means whereby the packing may be expanded.

6. A piston including, a body for mounting on a piston rod, an integral end plate at one end of the body, a removable end plate, means for clamping the removable end plate against the other end of the body and for re taining the body on the piston rod, expansible packing on the body between the end plates for slidably engaging the walls of a cylin- 1 3. A piston of the character described in 

